mirror of
https://github.com/hsoft/collapseos.git
synced 2024-11-24 08:18:04 +11:00
44 lines
751 B
NASM
44 lines
751 B
NASM
|
; io - handle ed's I/O
|
||
|
|
|
||
|
|
; *** Consts ***
|
||
|
|
;
|
||
|
|
; Max length of a line
|
||
|
|
.equ IO_MAXLEN 0x7f
|
||
|
|
|
||
|
|
; *** Variables ***
|
||
|
|
; Buffer for lines read from I/O.
|
||
|
|
.equ IO_LINE IO_RAMSTART
|
||
|
|
.equ IO_RAMEND IO_LINE+IO_MAXLEN+1 ; +1 for null
|
||
|
|
; *** Code ***
|
||
|
|
|
||
|
|
; Given an offset HL, read the line in IO_LINE, without LF and null terminates
|
||
|
|
; it. Make HL point to IO_LINE.
|
||
|
|
ioGetLine:
|
||
|
|
push af
|
||
|
|
push de
|
||
|
|
push bc
|
||
|
|
ld de, 0 ; limit ourselves to 16-bit for now
|
||
|
|
xor a ; absolute seek
|
||
|
|
call blkSeek
|
||
|
|
ld hl, IO_LINE
|
||
|
|
ld b, IO_MAXLEN
|
||
|
|
.loop:
|
||
|
|
call blkGetC
|
||
|
|
jr nz, .loopend
|
||
|
|
or a ; null? hum, weird. same as LF
|
||
|
|
jr z, .loopend
|
||
|
|
cp 0x0a
|
||
|
|
jr z, .loopend
|
||
|
|
ld (hl), a
|
||
|
|
inc hl
|
||
|
|
djnz .loop
|
||
|
|
.loopend:
|
||
|
|
; null-terminate the string
|
||
|
|
xor a
|
||
|
|
ld (hl), a
|
||
|
|
ld hl, IO_LINE
|
||
|
|
pop bc
|
||
|
|
pop de
|
||
|
|
pop af
|
||
|
|
ret
|